chgrp

Change group ownership

'chgrp' changes the group ownership of each given File to Group (which can be
either a group name or a numeric group id) or to match the same group as an existing reference
file.

Syntax
chgrp [Options]... {Group | --reference=File} File...
Key
-c
--changes
Verbosely describe the action for each File whose group actually
changes.
-f
--silent
--quiet
Do not print error messages about files whose group cannot be
changed.
-f
--no-dereference
Act on symbolic links themselves instead of what they point to.
Only available if the `lchown' system call is provided.
--reference=FILE
Use the group of the reference FILE instead of an explicit GROUP.
-v
--verbose
Verbosely describe the action or non-action taken for every File.
-R
--recursive
Recursively change the group ownership of directories and their
contents.

Example

Make Oracle the owner of the database directory$ chgrp oracle /usr/database

Groupthink - Tendency of decision makers to join together around a policy or person without questioning basic assumptions.